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Disentangling size effects and spectral inhomogeneity in carbon nanodots by ultrafast dynamical hole-burning†
Nanoscale ( IF 5.8 ) Pub Date : 2018-07-13 00:00:00 , DOI: 10.1039/c8nr02953a Alice Sciortino 1, 2, 3, 4, 5 , Michela Gazzetto 6, 7, 8, 9 , Gianpiero Buscarino 1, 2, 3, 4, 10 , Radian Popescu 11, 12, 13, 14 , Reinhard Schneider 11, 12, 13, 14 , Gaetano Giammona 2, 3, 4, 15, 16 , Dagmar Gerthsen 11, 12, 13, 14 , Egmont J. Rohwer 6, 7, 8, 9 , Nicolò Mauro 2, 3, 4, 15, 16 , Thomas Feurer 6, 7, 8, 9 , Andrea Cannizzo 6, 7, 8, 9 , Fabrizio Messina 1, 2, 3, 4, 10
Nanoscale ( IF 5.8 ) Pub Date : 2018-07-13 00:00:00 , DOI: 10.1039/c8nr02953a Alice Sciortino 1, 2, 3, 4, 5 , Michela Gazzetto 6, 7, 8, 9 , Gianpiero Buscarino 1, 2, 3, 4, 10 , Radian Popescu 11, 12, 13, 14 , Reinhard Schneider 11, 12, 13, 14 , Gaetano Giammona 2, 3, 4, 15, 16 , Dagmar Gerthsen 11, 12, 13, 14 , Egmont J. Rohwer 6, 7, 8, 9 , Nicolò Mauro 2, 3, 4, 15, 16 , Thomas Feurer 6, 7, 8, 9 , Andrea Cannizzo 6, 7, 8, 9 , Fabrizio Messina 1, 2, 3, 4, 10
Affiliation
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Carbon nanodots (CDs) are a novel family of nanomaterials exhibiting unique optical properties. In particular, their bright and tunable fluorescence redefines the paradigm of carbon as a “black” material and is considered very appealing for many applications. While the field keeps growing, understanding CDs fundamental properties and relating them to their variable structures becomes more and more critical. Two crucial problems concern the effect of size on the electronic structure of CDs, and to what extent their optical properties are influenced by structural disorder. Furthermore, it remains largely unclear whether traditional concepts borrowed from the photo-physics of semiconductor quantum dots can be applied to any type of CDs. We used femtosecond optical hole burning to address the excited-state properties of a family of CDs with the specific structure of β-C3N4. The experiments provide compelling evidence of the dramatic effects of structural heterogeneity on the optical spectra, and reveal the remarkably simple pattern of the electronic transitions of these CDs, normally obscured by disorder. Moreover, the data conclusively clarify the different effects of the nanometric size and of the disordered surface structure on the fluorescence tunability, ruling out for these CDs any quantum confinement effect comparable to semiconductor quantum dots.
中文翻译：
超快动态空穴燃烧可解开碳纳米点的尺寸效应和光谱不均匀性†
碳纳米点（CDs）是一种新型的纳米材料，具有独特的光学特性。特别是，它们明亮而可调谐的荧光重新定义了碳作为“黑色”材料的范式，并被认为在许多应用中非常有吸引力。在该领域不断发展的同时，了解CD的基本特性并将其与可变结构相关联变得越来越重要。两个关键问题涉及尺寸对CD电子结构的影响，以及它们的光学特性在多大程度上受结构紊乱的影响。此外，从半导体量子点的光物理技术中借来的传统概念是否可以应用于任何类型的CD，在很大程度上尚不清楚。3 N 4。实验为结构异质性对光谱的巨大影响提供了令人信服的证据，并揭示了这些CD的电子跃迁非常简单的模式，通常被无序掩盖。此外，数据最终阐明了纳米尺寸和无序表面结构对荧光可调性的不同影响，对于这些CD排除了任何与半导体量子点相当的量子限制效应。
更新日期：2018-07-13
中文翻译：
超快动态空穴燃烧可解开碳纳米点的尺寸效应和光谱不均匀性†
碳纳米点（CDs）是一种新型的纳米材料，具有独特的光学特性。特别是，它们明亮而可调谐的荧光重新定义了碳作为“黑色”材料的范式，并被认为在许多应用中非常有吸引力。在该领域不断发展的同时，了解CD的基本特性并将其与可变结构相关联变得越来越重要。两个关键问题涉及尺寸对CD电子结构的影响，以及它们的光学特性在多大程度上受结构紊乱的影响。此外，从半导体量子点的光物理技术中借来的传统概念是否可以应用于任何类型的CD，在很大程度上尚不清楚。3 N 4。实验为结构异质性对光谱的巨大影响提供了令人信服的证据，并揭示了这些CD的电子跃迁非常简单的模式，通常被无序掩盖。此外，数据最终阐明了纳米尺寸和无序表面结构对荧光可调性的不同影响，对于这些CD排除了任何与半导体量子点相当的量子限制效应。
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